Results 21 to 30 of about 100 (99)
Robotic Astronomy with the Faulkes Telescopes and Las Cumbres Observatory Global Telescope
Advances in Astronomy, Volume 2010, Issue 1, 2010., 2010 We present results from ongoing science projects conducted by members of the Faulkes Telescope (FT) team and Las Cumbres Observatory Global Telescope (LCOGT). Many of these projects incorporate observations carried out and analysed by FT users, comprising amateur astronomers and schools.
Fraser Lewis +5 more
wiley +1 more source
Free-floating Planet Mass Function from MOA-II 9 yr Survey toward the Galactic Bulge
The Astronomical Journal, 2023 We present the first measurement of the mass function of free-floating planets (FFPs), or very wide orbit planets down to an Earth mass, from the MOA-II microlensing survey in 2006–2014.
Takahiro Sumi +28 more
doaj +1 more source
Confirmation of Color-dependent Centroid Shift Measured After 1.8 Years with HST
The Astronomical Journal, 2023 We measured the precise masses of the host and planet in the OGLE-2003-BLG-235 system, when the lens and source were resolving, with 2018 Keck high resolution images.
Aparna Bhattacharya +12 more
doaj +1 more source
KMT-2022-BLG-2397: Brown Dwarf at the Upper Shore of the Einstein Desert
The Astronomical Journal, 2023 We measure the Einstein radius of the single-lens microlensing event KMT-2022-BLG-2397 to be θ _E = 24.8 ± 3.6 μ as, placing it at the upper shore of the Einstein Desert, 9 ≲ θ _E / μ as ≲ 25, between free-floating planets (FFPs) and bulge brown dwarfs ...
Andrew Gould +20 more
doaj +1 more source
Binary-lens Microlensing Degeneracy: Impact on Planetary Sensitivity and Mass-ratio Function
The Astronomical JournalGravitational microlensing is a unique method for discovering cold planets across a broad mass range. Reliable statistics of the microlensing planets require accurate sensitivity estimates.
Yuxin Shang +7 more
doaj +1 more source
OGLE-2016-BLG-1195 AO: Lens, Companion to Lens or Source, or None of the Above?
The Astronomical Journal, 2023 We systematically investigate Vandorou et al.’s claim to have detected the host star of the low-mass-ratio ( q < 10 ^−4 ) microlensing planet OGLE-2016-BLG-1195Lb, via Keck adaptive optics (AO) measurements Δ t = 4.12 yr after the event’s peak ( t _0 ...
Andrew Gould +6 more
doaj +1 more source
Two Low Mass-ratio Microlensing Planets and Two Types of Central-resonant Degeneracy
The Astronomical JournalWe present observations and analysis of two low planet/host mass-ratio ( q ) microlensing planets discovered in high-magnification events. KMT-2025-BLG-0811Lb has q ∼ 4.5 × 10 ^−5 , and a Bayesian analysis favors a super-Earth/mini-Neptune orbiting an M-
Yuchen Tang +45 more
doaj +1 more source
The Astronomical Journal, 2023 Wavelets are waveform functions that describe transient and unstable variations, such as noise. In this work, we study the advantages of discrete and continuous wavelet transforms (DWTs and CWTs) of microlensing data to denoise them and extract their ...
Sedighe Sajadian, Hossein Fatheddin
doaj +1 more source
Four Planets Found through Microlensing Events Involving Faint Source Stars
The Astronomical JournalTo conduct a comprehensive demographic study of microlensing planets, it is essential to detect all planetary signals that exceed a predefined threshold through a detailed analysis of survey data.
Cheongho Han +20 more
doaj +1 more source
The Astronomical Journal, 2023 We report the discoveries of low-mass free-floating planet (FFP) candidates from the analysis of 2006–2014 MOA-II Galactic bulge survey data. In this data set, we found 6111 microlensing candidates and identified a statistical sample consisting of 3535 ...
Naoki Koshimoto +31 more
doaj +1 more source